Combustion apparatus



June 19, w23.

J. S. ANDREWS COMBUSTION APPARATUS Orgial Filed July l,

l9l8 2 Sheets-Sheet 3 3 www4/bor f1 Holz 11e :j

FIG. ll..

J. s. ANDREWS COMBUSTION APPARATUD June .19, 1923.

4 2 Sheets-Sheet 2 Original Filed July l, 1918 Figa. 2

FIG. 5-

Patented v.lune i9, i923.

, nutren stares intatta earner criticism JOHN S. ANDREVJS, OF GARY, ENDANA.

COMBUSTION APPARATUS.

Application filed July 1, 1918. Serial No. 242,758. Renewed November 1l?, 192%.`

To ZZ whom. t may concern:

Bc it known that l, loi-1N S. ANnnnws, a citizen ofthe United States, residing` at the city of Gary, in the county of Lake and State of Indiana, have invented certain new and useful lmprovementsin Combustion Apparatus, of which the following is a specilition.

My invention relates to the combustion ot' fuel in the furnaces and fire boxes of boilers and particularlJ to the use ot high volatile coals therein. i 'lnder ordinary conditions a. large portion of the gases and carbon given oil' at the first application of heat to the coal passes through the apparatus unconsumed and with entire loss of their heat values, and ap )ears at the chimney top as atmospheric polluting smoke and vapor. lt is the object of my invention, and in the practice thereof I am able to consume the gases and smoke of common bituminous coal in the furnace thereby greatly increasing their practical efficiency and conserve their entire fuel values.

My improvement is simple and readily at.- tached to fire boX or tubular boilers whether alread used or in process of construction, with tlie additional advantage of increasing their steaming capacity.

The principles of my invention are illustrated in the drawings in which,

" Figure l represents a vertical section of a fire box on the line I-I of Fig. 2;

Figure 2 is a vertical section of the same on the line ll-H of Fig. l;

Figure 3 is an enlarged vertical section of my appliance on line Ille-Ill of Fig. l and illustrates the Water circulation therein;

Figure i shows another construction of said improvement; and

Figure 5 is a horizontal section on the lineA V-V of Fig. l.

`Further describing my invention with reference to the drawings in which like characters of reference denote like parts,

l. is a wall upon which is supported a boiler having thcshell Q, the fire box with side Walls 3-3 and crown sheet 4. Fines 5 lead from the rear portion of the fire box and 6--6 are the grate bars on which tlie fuel is supiorted. Transversely of tlie fire box n wall dependent over the grate. Said fire walls comprise. a' hollow front member "Z, ahollow rear member 8 and tubular connections 9 and 10 by which the said liront and rear members are internally connected place a unitary firey and by which they are also spaced from each other to form the downflue 1l. Said i members are of suitable sheet met-al and the constituent parts thereof may be secured together by welding or by riveting in the` ordinary manner of boiler construction. The

rear member 8 should be somewhat higher than the front member 7 and the top thereof should extend thereabove sufficiently to take the boiler connections 13 and to permit them to pass forwardly over the top of the front member. Said connections may be provided im.,

'with elbows la and nipples 15 by which attachment is made to the crown sheete' and thereby interior connection made between the said rear member and the boilerwln like manner the front member 7 is internally device and in accordance with the judgment i of the maker. lt is important to have free circulation `of water through the device. This should be borne in mind in arranging such details of construction,although the arrangement shown may be found fully effective under all ordinary conditions. The circulation of water therethrough will be substantially as indicated by the arrows in'Fig. 3. The burningof the plates, of which'the dependent wall is constructed, is thereby prevented while a considerably increased steaming capacity is added to the boiler.

l'n installing the apparatus, the ends should lit tightly against the sides of thelire box or any spaces therebetween should be closed and sealed against the passage of gases by a lire clay or other refractory material 20. And the top of the rear member should be closed in like manner with reference to the crown sheet. In practice7 ll prefer to do this by means of fire brick 24 using such loting as may be necessary to make practically gas-tight joints.

In practical use when a tire box is equipped as described with my improvement the fire is built upon the grate bars 6 in the usual manner, so that the fuel forms a bed,

the top of which is closely adjacent to the lower edges of the hanging lire wall formed as above described. lllhen additional fuel is added it will cover the space between such wall and the door. As the smoke and the free gases of combustion are given olf, they pass upwardly and between the crown sheet and the top of the front member of the depending lire wall, and thence through the downilue between the two members as indicated by the arrows, thereby coming' in contact with the surface of the heated coal body where they'are completely consumed. As the combustion proceeds and the fuel is more or less coked, it will fall forwardly into the more highly heated area under and beyond the said hanging Nall, which action should be aided in the process of tiring, thereby maintaining the bright fire and the high heat-of that section of theiire box. Space is thus afforded into which additional quantitles of fresh fuel are supplied from time to time as needed, where it is eolfed and the distilled gases are given oit to 'be passed to the front of the iire box as hereinbefore explained.

l have described my invention with refer-- ence to a fire boiler, and I have illustrated the two members forming the arch or fire wall as constructed in one piece as shown in Fig. l, or in two pieces as shown in Fig. 4. Which particular form is used will depend on convenience of installation. In most cases it is possible to use unitary members. But whether made in one or more sections the principle oit' operation is the same; each member is to be considered as a unit and such constructions are to be held equivalent and so understood throughout the specification and claims.

lt is also evident that my improvements may be applied to different forms of boilers well as to new ones in course of construction, so that the form, connections and means ofattaclnnent may be greatly variedv according to the necessities of the particular case without departing from the essential principles involved.

What l claim as new is 1. furnace structure having' a boiler, iire box, and ash pit` a i'lependingbaille wall structure dividing' the fire box into a front firing chamber and a rear combustion cham ber and extending downwardly to the norn'ial top level of the fuel` a grate underneath the lire box. said baille wall including` a hollow front wall member and a hollow rear wall .member directly interiorly connected together and. spaced from each other to form a down draft passageway therebetween and separate means interior-ly connecting each of said hollow wall members directly with the interior of the boiler.

2. A furnace structure having a boiler, iire box, and ash pit, a depending` baille wall structure dividing the tire box into a front iiring chamber and a rear combustion charm ber and extending downwardly to the normal top level of the fuel, a grate underneath the iire box, said baille wall including a hollow front wall member and a hollow rear wall member directly interiorly connected together and spaced from each other to form. a down draft passageway therebetween, means interiorly connecting one of said members with the upper part of the boiler and means interiorly connecting the other of said wall members with a lower part of the boiler;

3. A furnace structure having a boiler, fire box, and ash pit, a depending baille wall structure dividing the fire box into a front firing chamber and a rear combustion chamber and extending' downwardly to the normal top level of the fuel, a grate underneath the ilre box, said baille wall including a hollow front wall member and a hollow rear wall member directly interiorly connected together and spaced from each other to form a down draft passageway therebetween, means interiorly connecting the rear member with the upper part of the boiler and means interiorly connecting the front wall member with the lower part of the boiler.

4. A furnace structure having a boiler, lire box, and ash pit, a depending baille wall structure dividing the fire box into a 'liront iirin;l chamber and a rear combustion chamher and extending downwardly to the normal top level ot' the fuel, a grate underneath the fire box, said baille wall being in the form of a unitary attachment and comprising a hollow front member and a hollow rear member, tubular devices interiorly connecting said members and spacing' them for the establishment of a. down ilue therebetween, a hollow device making interior connection between the upper part of said rear member and the interior of the boiler, and a tubular device making` interior connection between the lower part of said front member and the irterior of said boiler.

5. A furnace structure having a boiler. tire box, and ash pit.j a depending baille wall structure dividing' the fire box into a front lfiring' chamber and a rear combustion chamber, and extending downwardly to the normal top level oi the fuel, a grate underneath the lire box. said baille wall being in the form of a unitarjir attachment and comprising' a hollow front member and a hollow rear member having its top higher than the top of said front nicn'iber, tubular devices in` teriorly connecting: said .members and spacing' them for the establishment of a down ilue therebetween, a hollow device making interior connection between the upper part of said rear member and the'interior of the boiler, and a tubular device makinginterior connection between the lower part of said front member and the interior of said boiler.

6. A furnace structure'having a boiler,

'hollow front member, a hollow rear member extended to a greater height 'than the front member and in closed relation with the top of the tire box, tubular devices intcriorly connecting said members and spacing them from each other to form a down flue therebetween, a hollow device making interior connection between the upper part of said rearmember and the interior oli-the boiler', and a tubular device making interior connection between the lower part of Said front member and the boiler.

T A furnace structure having' a boiler, lire box, and ash pit, a depending baille wall structure dividinglr the fire box into a front tiring chamber and a rear combustion chamber and extending downwardly to the normal top level of the fuel, a grateunderneath the fire box, said balle wall being' in the form oi' a unitary attachment and comprising a hollow .front member. a hollow rear member, means extended above thev top of :said rear member to establish the same in. closed relation to the top ot' the tire box, tubular devices interior'ly connecting said member and spacing them from each other to form a down flue therebetween, a hollow device making interior connection between the upper part of Said rear member and the in-V terior of the boiler, and a tubular device making interior connection betweenthe lower partof Said front member and the boiler.

8. A furnace structure having a boiler, tire box, and ash pit, a depending baille wall structure dividingy the fire box into a front tiring chamber and a rear combustion chamber and extending downwardly to the normal top level oi the fuel. a g 'ate underneath the fire box, said baille wall beineV in the form of a unitary attachment and comprising a substantially vertical hollow front. member, a substantially vertical hollow rear member extended higher than the Yfront member and in closed relation with the top of the lire box, horizontal tubular devices at the tops and bottoms of said members interiorly connectingr the same and Spacing them from each other to form a down tine therebetween, a hollow device making interior connection between the upper part of said rear member and the interior ot' the boiler, and a hollow device makingV interior connection between the lower part of said front member and a lower part of the boiler.

JOHN ANDREvVS. 

